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<body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
<h2>Relativity</h2>

<p>Each color is perceived in relation to other colors. 
The top and bottom bars each contain the same component colors,
but a different display order causes individual colors to appear differently.</p>

<p><a href="http://processing.org/learning/basics/relativity.html"><b>Original Processing.org Example:</b> Relativity</a><br>
<script type="application/processing">
color a, b, c, d, e;

void setup() {
  size(200, 200);
  noStroke();
  a = color(165, 167, 20);
  b = color(77, 86, 59);
  c = color(42, 106, 105);
  d = color(165, 89, 20);
  e = color(146, 150, 127);
  noLoop();
}

void draw() {
  drawBand(a, b, c, d, e, 0, 4);
  drawBand(c, a, d, b, e, height/2, 4);
}

void drawBand(color v, color w, color x, color y, color z, int ypos, int barWidth) {
  int num = 5;
  color[] colorOrder = { v, w, x, y, z };
  for(int i = 0; i < width; i += barWidth*num) {
    for(int j = 0; j < num; j++) {
      fill(colorOrder[j]);
      rect(i+j*barWidth, ypos, barWidth, height/2);
    }
  }
}
</script><canvas width="200" height="200"></canvas></p>
<div style="height:0px;width:0px;overflow:hidden;"></div>

<pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a>
// unless otherwise stated.</b>
color a, b, c, d, e;

void setup() {
  size(200, 200);
  noStroke();
  a = color(165, 167, 20);
  b = color(77, 86, 59);
  c = color(42, 106, 105);
  d = color(165, 89, 20);
  e = color(146, 150, 127);
  noLoop();
}

void draw() {
  drawBand(a, b, c, d, e, 0, 4);
  drawBand(c, a, d, b, e, height/2, 4);
}

void drawBand(color v, color w, color x, color y, color z, int ypos, int barWidth) {
  int num = 5;
  color[] colorOrder = { v, w, x, y, z };
  for(int i = 0; i &lt; width; i += barWidth*num) {
    for(int j = 0; j &lt; num; j++) {
      fill(colorOrder[j]);
      rect(i+j*barWidth, ypos, barWidth, height/2);
    }
  }
}</pre>
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